Hard tool and implement and in process of making



Patented @ct. 2i, 3%24.

rates HEINRICH BAUMHAUEB, OF CEARLOTTENBURG, NEAR BERLIN, GERM, ASSIGNOR T GENERAL ELECTRIC COMPANY, CO-MORA'I'ION OF NEW YORK.

HARD TOOL AND DWIPLEMEN'I' AND IN PROCESS 0F MAKING.

No Drawing.

To 0111 whom it may concern:

Be it .known that I, HEINRICH BAUM- HAUER, a citizen of the German Republic, residing at Charlottenburg, near Berlin, Germany, have invented certain new and useful Improvements in Hard Tools and Implements and in Processes of Making, of which the following is a specification.

My invention relates to hard tools and implements and the process of making them. I-Ieretofore devices of the above character have been made of carbide of tungsten or molybdenum but they have proven too brittle and too porous and consequently are not satisfactory. In particular, drawing blocks for the manufacture of tungsten wires made from material of-the above character have been quite unsatisfactory.

Therefore, itis one of the objects of my invention to treat the implement made from such ca'rbide so as to render it free from the foregoing objections, and to provide tools that may be used satisfactorily for drawing,

wire from tungsten and other elements of similar hardness.

The details of my invention are hereinafter more fully set forth and claimed. In the process of my invention the implement may be obtained in either of several ways, for example, the carbide itself may be em ployed or a mixture of carbon and the car'- bide producing element may be pressed, after which the article may be, sintered. Also the element may be vbrought to, the desired form without carbon by sintering the same to a non-dense form" and then carburizing. The carburizing can. be done by' saturating with substances which after glowing leave carbon. Asan example of such substances we have sugar, tar and the like. After the carburizing process is complete, the article is'then heated. The carburizing may also be done by heating in a a carburizing atmosphere such as illuminat ing gas, carbon inonoxide, etc., or by heating while packed in carbon dust and the like.

The porous carbide body thus formed-is then saturated with a metal. Such a metal must be one which is more easily fusible than the carbide. 'A metal which is adapted which consists in impregnating the pores of for this purpose is, for example, iron. By

this operation, the iron or other similar' metal is brought into contact with the sur- I face of the carbide body, the whole being heated to the meltingpoint of the iron or Application filed December 27, 1922. Serial No. 569,837.

- other metal, thereby permitting the iron or such metal to soak into the carbide, the latter absorbing the molten metal.

In order to facilitate the absorption process, the carbide surface to be exposed to the metal is made as large as possible. In

the process, after the first soaking operation," the treatment with the molten metal may beblocks for the manufacture of wire froni such hard metals as tungsten, molybdenum and the like. Thismaterial is also suitable for tools and other purposes.

What I claim as new and desire to secure by Letters Patent of the United States, is-

1 The processof treating a metal carbide which consists in saturating the pores of the carbide with a metal. 7

2. The p1 ocess of treating a metal carbide which consists in saturating the pores of the carbide with iron.

3. The process of treating a porous sin tered piece of tungsten which consists in first Sllb]6CtlI1g the tungsten to the carburizing process and then saturating the pores of the carbide with a metal.

4. A tool for working hard metals made from a carbide with its pores saturated with a metal. V

i 5. A tool for working hard metals made from a tungsten carbide with its pores saturated with a metal.

6. The process of treating a carbide which consists in impregnating the pores of the carbide with a metal.-

I 7. A tool made from a carbide impregnated with a metal.

8. The process of treating a metal carbide the carbide with a metal.-

In witness whereof, I have hereunto set my hand this 4th day of December, 1922.

HEINRICH BAUMHAUER. 

